Q. What is refractive index ?

A) it is defined as the product of speed of light in medium and in vacuum.

B) it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

C) None of above

D) it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

✔ Correct Answer: it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

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